Even if Christie swept the somewhat even vaguely possible states for him, the election would still get thrown to the Tea Party House, where the Republicans would vote their own guy for president, not Christie. More likely is that he wins few if any states even if he performs well in the popular vote.
A Presidential election thrown to this congress would take multiple ballots to reach a consensus.
You both seem to be under the mistaken impression that if the election goes to the House, they can vote for whoever they want. The House can only vote for candidates that received electoral votes (the top three, I believe, if there are more than three) and in a Clinton/Christie matchup, they would undoubtedly elect Christie on the first ballot.